In recent years, sulfamic acid (SA, NH2SO3H) has emerged as a novel green catalyst for organic synthesis because of several advantages, including its non-volatility, non-hygroscopicity, non-corrosivity, and low cost. This work reports the use of sulfamic acid as a catalyst in the pretreatment of oil with a high content of free fatty acids (10 and 20 % FFA) in ethanol or methanol. The process (esterification reaction) used in the pretreatment of the oil was carried out under a variety of conditions, initial fatty acid content, temperature, type of alcohol, and % catalyst. The experiments using an NH2SO3H/ethanol system resulted in a high fatty acid ethyl ester conversion, 88.53 % (±0.95) from an initial acidity of 40 mg KOH/g (20 % FFA), using 8 % NH2SO3H as the catalyst. According to the results, the methodology using sulfamic acid and ethanol demonstrated elevated potential for a environmentally-friendly means of biodiesel production.
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The authors would like to thank the Ministry of Science and Technology (MCT)/Research and Projects Financing (FINEP) and CNPq (National Council for Scientific and Technological Development) for financial support.
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Conflict of interest
The authors have declared no conflict of interests.
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